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4.1.1 Centre
Centre
controls the centre frequency for the sweep. Also sets the annotation to
Centre/Span if it was previously Start/Stop. Creates a set of bottom-row function
keys as follows:
Set
Centre
enables the centre frequency to be set to a specific value. The menu keys are
replaced by a numeric keyboard from which a centre frequency can be entered in
MHz to a resolution of 0.0001 (100Hz).
Press OK to activate the new frequency without leaving the screen or OK & Exit to
return to the Centre menu. Once a new frequency has been set from this screen,
the Previous key can be used to return to the previous frequency and then toggle
between the two.
Pressing Set by Tab/Jog selects an alternative setting screen in which frequencies
are set by “jogging” each digit up or down. Note that whichever method of setting
frequency is used becomes the default whenever Set Centre is pressed. See
section 7.3 for an illustrated description of frequency setting.
Set
C=M1
Set
C=Pk
Step
Down
sets the centre frequency to the frequency value of the M1 marker (when active).
sets the centre frequency to the frequency value of the highest amplitude point in
the current sweep.
Step
Up
changes the centre frequency by the value of the step size
- see section 4.1.4.
4.1.2 Span
Span
controls the span for the sweep. Also sets the annotation to Centre/Span if it was
previously Start/Stop. Creates a set of bottom-row function keys as follows:
Set
Span
enables the span to be set to a specific value. The method for setting the span is
similar to that for setting the Centre frequency - see section 7.3 for an illustrated
description of frequency setting.
Set to
Mdelta
sets the span equal to the frequency difference between the M1 and M2 markers (if
active).
Zoom
Out
Zero
Span
Zoom
In
sets the span to a higher or lower value in a 1-2-5 sequence starting from
the existing span value. (Example: if the existing span is 1.7MHz, the first
press of Zoom Out will take it to 2MHz and the next press to 5MHz).
changes the sweep mode of the spectrum analyser and opens the Zero Span sub
menu - see section 4.2.
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